Identification of alkylpyrocatechols by thin-layer chromatography on silica gel

Abstract:Cu (II) complexes with the sterically hindered diphenol derivatives 3,5-di(tertbutyl)-1,2-benzenediol (I), 4,6-di(tert-butyl)-1,2,3-benzenetriol (II) and the sulfur-containing 4,6-di(tert-butyl)-3-(2-hydroxyethylsulfanyl)-1,2-benzenediol (III) and 2-[4,6-di(tert-butyl)-2,3-dihydroxyphenylsulfanyl]acetic acid (IV) have been synthesized and characterized by elemental analysis, TG/DTA, FT-IR, ESR, XPS, XPD and conductivity measurements. Compounds I-III can coordinate in their singly deprotonated forms and act as bidentate ligands. These compounds yield Cu (II) complexes of the stoichiometry Cu(L) 2 , which have square planar geometry (g > g ⊥ >g e ). Unlike them, compound IV behaves as a terdentate ligand, and its complex Cu(L IV ) 2 has distorted octahedral geometry. According to ESR data, only the Cu(L II ) 2 complex contains a very small amount of phenoxyl radicals. Antimicrobial activities of these ligands and their respective Cu (II) complexes have been determined with respect to Gram-positive and Gram-negative bacteria, as well as on yeasts. Their phytotoxic properties against Chlorella vulgaris 157 were also examined.

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“…The SHD derivatives were prepared according to literature methods [5,7,[36][37][38][39]. The preparation of Cu (II) complexes is described below.…”

Section: Methodsmentioning

confidence: 99%